I have an early Tournament Soccer table that has the same type of lock system. TS and DM tables are very similar so i wouldn't be surprised if it was the same set up. A keyhole on either end that require a "skeleton key" to open. I removed the lock systems from the table and took it to a local locksmith. For $30, he was able to make me a couple keys that work remarkably well. Assuming you still have the locking mechanisms that are attached to the inside of the table, you should be able to do the same. If you want pictures of the one I restored, send me your email address and i will send them to you. I was in your same spot a couple months ago.
Good luck.
Randy